Distinguishing fissions of 232Th, 237Np and 238U with beta-delayed gamma rays
A. Iyengar, E.B. Norman, C. Howard, C. Angell, A. Kaplan, J. J., Ressler, P. Chodash, E. Swanberg, A. Czeszumska, B. Wang, R. Yee, H.A., Shugart
TL;DR
This study measures beta-delayed gamma-ray spectra from neutron-induced fissions of 232Th, 237Np, and 238U to identify isotopes based on gamma-ray line ratios over time.
Contribution
It introduces a method to distinguish fissioning isotopes using gamma-ray intensity ratios from post-irradiation spectra.
Findings
Gamma-ray line ratios vary distinctly among isotopes.
Identification of isotopes is possible within minutes to hours after fission.
Spectral data enable isotope discrimination in nuclear forensics.
Abstract
Measurements of beta-delayed gamma-ray spectra following 14-MeV neutron-induced fissions of 232Th, 237Np, and 238U were conducted at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron. Spectra were collected for times ranging from 1 minute to 14 hours after irradiation. Intensity ratios of gamma-ray lines were extracted from the data that allow identification of the fissioning isotope.
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